Ipv6 Network not reachable

I had ipv6 working on this machine in the past, but not anymore, for some reason:

Source Code

root@homeserver:~# ifconfig eth0

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500

inet 192.168.177.3 netmask 255.255.255.0 broadcast 192.168.177.255

inet6 fd00::222:4dff:feaa:27bb prefixlen 64 scopeid 0x0<global>

inet6 fe80::222:4dff:feaa:27bb prefixlen 64 scopeid 0x20<link>

ether 00:22:4d:aa:27:bb txqueuelen 1000 (Ethernet)

RX packets 465 bytes 85238 (83.2 KiB)

RX errors 0 dropped 14 overruns 0 frame 0

TX packets 571 bytes 243982 (238.2 KiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

device interrupt 20 memory 0xf7f00000-f7f20000

root@homeserver:~# ping6 www.google.com

connect: Network unreachable

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I can fix this by:

Source Code

ip -6 addr add fd00::ecb6:9a43:32c3:1234 dev eth0

So, I assume the reason is the dhcp (v6)

Source Code

dhclient -6 -r eth0

root@homeserver:~# dhclient -6 eth0 -v

Internet Systems Consortium DHCP Client 4.3.5

Copyright 2004-2016 Internet Systems Consortium.

All rights reserved.

For info, please visit https://www.isc.org/software/dhcp/

Listening on Socket/eth0

Sending on Socket/eth0

PRC: Soliciting for leases (INIT).

XMT: Forming Solicit, 0 ms elapsed.

XMT: X-- IA_NA 4d:aa:27:bb

XMT: | X-- Request renew in +3600

XMT: | X-- Request rebind in +5400

XMT: Solicit on eth0, interval 1020ms.

XMT: Forming Solicit, 1020 ms elapsed.

XMT: X-- IA_NA 4d:aa:27:bb

XMT: | X-- Request renew in +3600

XMT: | X-- Request rebind in +5400

XMT: Solicit on eth0, interval 1940ms.

XMT: Forming Solicit, 2960 ms elapsed.

XMT: X-- IA_NA 4d:aa:27:bb

XMT: | X-- Request renew in +3600

XMT: | X-- Request rebind in +5400

XMT: Solicit on eth0, interval 3700ms.

XMT: Forming Solicit, 6660 ms elapsed.

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I do not know what this means though.

The configuration on this machine is very similar to another machine that I administer (at a different place). The difference is that the other machine uses dhcp v4 as well and wifi instead of wired connection.